What were 3 things James Monroe did while he was in office?

During his presidency from 1817 to 1825, James Monroe oversaw the expansion of the United States through the acquisition of Florida from Spain in 1819. He also established the Monroe Doctrine in 1823, which asserted that European nations should no longer colonize or interfere in the Americas. Additionally, Monroe's administration focused on national unity and economic development, promoting infrastructure improvements and supporting the American System.